You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Here Mary Martinez.

ASSISTANT: How can I help you?

USER: Owing to an emergency, I need to change my existing reservation. Can you please help me in my ticket changing process?

ASSISTANT: Sorry, no reservation found by your name.

USER: No problem with that one, thank you for providing the information in very quick manner.

ASSISTANT: Thank you.

USER: Welcome.