You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my travelling dates in my previous ticket. Can you please help me in changing my ticket?

ASSISTANT: Sure, may I know your name please to check the reservation status?

USER: I am Emma Hall.

ASSISTANT: Emma, there is no reservation found with your details.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us, have a good day.

USER: Welcome.