You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I help you?

USER: Owing to an emergency I had to request for change reservation.

ASSISTANT: Sure, please provide me your name to check the details.

USER: My name is Christopher Mitchell.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: There is no reservation with your name.

USER: Thanks for your help.

ASSISTANT: Thank you for reaching us.