You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: My business meeting got postponed, can you please help me in changing the reservation?

ASSISTANT: Sure, I'm here to help you always. Can you please provide the name on which you have done your reservation?

USER: I am William Martin.

ASSISTANT: Ok, please allow me a minute to check your reservation status.

USER: Ok.

ASSISTANT: I found your reservation, can you please provide your source and destination airport codes?

USER: My source and destination airport codes are LGA and IAH.

ASSISTANT: May I know your departure and arrival travel dates please?

USER: I want to start my journey on Sept 29th and return on Oct 1st.

ASSISTANT: May I know in which class do you prefer to travel?

USER: I am comfortable with any class.

ASSISTANT: In which airlines do you prefer to travel?

USER: I am fine with any airline.

ASSISTANT: Please let me know if you have any time concerns.

USER: I want to depart in the morning.

ASSISTANT: May I know how may connections are you expecting in between your journey?

USER: I want a maximum number of single connection.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no flights available on those dates with your given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.