You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, How may I help you?

USER: I want to change my existing reservation because my meeting got postponed. Can you help me with that?

ASSISTANT: Ok, please specify your name, to check with the list.

USER: My name is Thomas Scott.

ASSISTANT: Thanks for waiting, but no reservation on your name.

USER: Ok, no issues.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your response.