You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you today/.

USER: Owing an emergency want to change my existing reservation, can you please help me in changing it?

ASSISTANT: May I know your name, please?

USER: Yes, I am Susan Hill.

ASSISTANT: We found your reservation, please provide your new journey dates.

USER: Sure, I have planned to travel on 10/27 and return on 10/29.

ASSISTANT: From where do you want to board and land?

USER: My boarding and landing airport codes are Houston, TX-HOU and San Francisco, CA-SFO.

ASSISTANT: Do you have any other requirements to be meet?

USER: Yes, I need a direct flight.

ASSISTANT: Sorry, we have a connecting flight.

USER: That's ok, please don't proceed further.

ASSISTANT: Ok.

USER: Thank you for the response.

ASSISTANT: Thank you for choosing us.