You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I address you?

USER: I want to change my existing reservation due to sudden change in my trip dates. Can you help me in doing that?

ASSISTANT: Sure, I will help you. May I know your name?

USER: I am Christopher Edwards.

ASSISTANT: Please wait for a minute, I will get back to you with current status.

USER: Sure.

ASSISTANT: There is no reservation found with your name to change.

USER: Ok, no worries at all.

ASSISTANT: Thanks for reaching us.

USER: Thank you for your kind information.