You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I want to change my existing reservation due to sudden change in my family trip dates. Can you help me with that?

ASSISTANT: Sure, we are here to help you to change your reservation.

USER: Thank you.

ASSISTANT: Let me know your name to change it.

USER: I am Rebecca Perez.

ASSISTANT: Thanks for providing your name. Please wait for a while, I will check the present status of your recent reservation.

USER: Sure.

ASSISTANT: Thanks for being patient, we did not find any reservation on your name.

USER: Ok, no worries at all. Thank you for your quick response.

ASSISTANT: Thank you for approaching us.