You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Nicholas Gonzalez here.

ASSISTANT: How can I aid you?

USER: As my planned trip has been postponed to some other dates, I need your help me in altering my reservation details. Will you help me with that?

ASSISTANT: Sure, I will help you with that. Nicholas Gonzalez, we couldn't find any flights under your name in our database.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you for reaching us.