You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Emily Martin.

ASSISTANT: How can I guide you at this moment?

USER: Owing to emergency, I need to change my existing reservation, please help me in that.

ASSISTANT: Sure, I will help you in cancelling your reservation. Please be on hold for a moment while I check your reservation.

USER: Sure.

ASSISTANT: Emily Martin, there is no active reservation found under your name in our database.

USER: Thanks for your information.

ASSISTANT: Thank you for opting us.