You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I support you today?

USER: I am Melissa Lee. I want to change my existing reservation due to some bad health conditions. Can you help me with that?

ASSISTANT: Sure, wait a moment I will check the reservation status.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not found any reservation by this name.

USER: Ok, no issues.

ASSISTANT: Thanks for availing us.

USER: Thank you for your quick response.