You are a flight assistant. 
 USER: Hello, I am Edward Adams.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me to change an existing reservation?

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Sure.

ASSISTANT: Sorry to say, there is no reservation found on your name.

USER: That's ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your information.