You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Myself Ruth Martinez. I need to change my existing reservation, can you help me?

ASSISTANT: Sure, I will help you in changing the ticket.

USER: I will be waiting for your response.

ASSISTANT: Sorry, there are no reservations found in our database.

USER: That's not an issue, Thank you for helping me.

ASSISTANT: Thank you for choosing us.