You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Would it be possible for you to change my reservation, which I have done with my name?

ASSISTANT: Sure, may I know your name?

USER: My name is Dorothy Adams.

ASSISTANT: Please wait a moment I will check the reservation and get back to you.

USER: Sure.

ASSISTANT: Sorry for the trouble which is caused to you, there is no reservation found with your name in our system data to change the travelling dates.

USER: No problem, thank you for your help.

ASSISTANT: Thanks for reaching us.