You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Samantha Hernandez here.

ASSISTANT: How may I support you today?

USER: Can you please be my helping hand in changing my existing reservation?

ASSISTANT: Sure, I'll help you.

USER: Thank you.

ASSISTANT: Please wait a moment I'll check the reservation list.

USER: Sure.

ASSISTANT: Thank you for waiting, we are happy to inform you that there is reservation by this name.

USER: Ok.

ASSISTANT: Can you please share your updated journey dates?

USER: My airport codes are SFO - JFK. My trip dates are 01/14 - 01/16.

ASSISTANT: Do you need a break in between your journey?

USER: I need a direct flight.

ASSISTANT: Is there any other specifications?

USER: I prefer to go by an economy class.

ASSISTANT: Thank you for sharing your journey details, sorry to inform you that there are no flights found with your essential details.

USER: Not a problem, thank you.

ASSISTANT: Thank you for approaching us.