You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Deborah Baker.

ASSISTANT: How may I guide you?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure Baker, I am here to help you with that. Let me check your reservation status in our records.

USER: Ok.

ASSISTANT: I found a reservation, can you please share me your source airport code and destination airport code?

USER: My source is LAX and destination is PHX.

ASSISTANT: When you are willing to travel?

USER: My trip dates are 07/20 to 07/22.

ASSISTANT: Just a moment.

USER: Sure.

ASSISTANT: Baker sorry for inconvenience, no flights are available with your requirements.

USER: No issue, thank you for checking.

ASSISTANT: You are welcome.