You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Richard Allen. I want to change my existing reservation due to some technical issues. Can you help me with that?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found in your name.

USER: No issues. Thank your for your quick response.

ASSISTANT: Thank you for choosing us.