You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Edwards Parker.

ASSISTANT: How can I assist you?

USER: My holiday trip has been postponed, so I would like to change my existing reservation. Could you please help me with that?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: I am sorry there is no reservation with your details.

USER: That's ok. Thank you for the information.

ASSISTANT: Thank you for approaching us.

USER: You are welcome.