You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Due to an emergency, I want to change my reservation. Can you help me?

ASSISTANT: Sure, I will help you. To check the reservation list we need your name, can you please share me your name?

USER: Jessica Mitchell here.

ASSISTANT: Sorry Jessica Mitchell, there is no reservation on your name.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you so much for choosing us.