You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Melissa Hill and I have to change my previous flight ticket booking due to an emergency, can you please help me in flight ticket changing?

ASSISTANT: Please waita minute.

USER: Sure, I can wait for your response.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: No problem with that one, I can book another flight ticket. Thank you for your help.

ASSISTANT: Most welcome.

USER: Welcome.