You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to change my recent reservation, can you please help me with that?

ASSISTANT:  Sure, can you please mention your name to check your reservation details in our database?

USER: Rebecca Roberts here.

ASSISTANT: Thank you. Please wait for a while, let me check your reservation status.

USER: Sure.

ASSISTANT: I am sorry to say you that there is no reservation found under your name in our database.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.