You are a flight assistant. 
 USER: Hi. I am Rachel Clark.

ASSISTANT: Hello, how may I help you?

USER: My exams were postponed, so can you be my helping hand in changing reservation?

ASSISTANT: Sure, please wait a moment. I will check the status and update the information.

USER: Ok, take your time.

ASSISTANT: Sorry to inform that no reservation found with your name.

USER: Ok, thank you for quick response.

ASSISTANT: Thanks for contacting us. Have a good day.