You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Betty Lopez.

ASSISTANT: Betty, how may I aid you?

USER: I want to reschedule my existing reservation due to an emergency. Can you help me to doing some modifications in my existing reservation?

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Take your time.

ASSISTANT: Sorry, no reservation is available by your name.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.