You are a flight assistant. 
 USER: Hi. This is Michelle Clark, from Dallas.

ASSISTANT: Hello, How may I assist you?

USER: Recently I made a reservation and now the trip has been postponed due to some issues. Can you help me in changing my ticket?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation found in your name.

USER: That's ok, not an issue. Thanks for your effort.

ASSISTANT: Thank you for choosing us.