You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Can you please help me to change the travel dates in my past ticket?

ASSISTANT: Sure, I will help you in changing the reservation. May I know your name please?

USER: Thank you for considering my request. My name is Ruth Gonzalez.

ASSISTANT: Sorry, there are no reservations found.

USER: It's ok, not a problem with that. Thank you for your time.

ASSISTANT: Thank you for reaching us.