You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Stephen Mitchell. Can you please help me in changing my existing reservation, as my football match got postponed to some other date.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment, I will find the status of your reservation.

USER: Ok.

ASSISTANT: I have found your reservation, can you please provide your airport codes?

USER: My new airport codes are EWR to ORD.

ASSISTANT: May I know your planned travel dates please?

USER: My travel dates are Feb 11 to Feb 13.

ASSISTANT: Do you have any connection preference?

USER: I need a single connection of flight.

ASSISTANT: May I know your arrival and departure timings?

USER: I would like to depart in the morning.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Stephen Mitchell, no flights has been found on your planned travel dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.