You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Owning to an emergency I want to change my existing reservation. Can you please help me with this?

ASSISTANT: Sure, I am here to help you out. May I know your name please?

USER: Sure, my name is Margaret Jackson.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: We found your reservation under your name, can you please share your airport codes?

USER: Sure, my airport codes are SEA - HOU.

ASSISTANT: May I know your travelling dates please?

USER: I want to depart on Feb 26 and need to return on Feb 28.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need a connecting flight which departs in the evening time.

ASSISTANT: Margaret Jackson, there are no flights available in your route.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the information.