You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I am Melissa Rodriguez. Please help me in changing my existing reservation, as my college fest got postponed. Please help me in changing?

ASSISTANT: Sure, we are here to help you. Please give me a moment to check your details and I will revert to you. Sorry for the inconvenience, there is no existing reservation found on your name to proceed further.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for consulting us.