You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Christine Rodriguez. Please help me in changing my recent reservation.

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: We have found your reservation, can you please share your airport codes?

USER: My airport codes are from EWR to SFO.

ASSISTANT: May I know your travel dates please?

USER: My journey dates are from Oct 20 to Oct 22.

ASSISTANT: Do you prefer either business or economy class?

USER: I am comfortable with any class.

ASSISTANT: May I know your connection limit please?

USER: I need a connecting flight.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: I want to depart in the evening time.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Christine Rodriguez, there are no flights available in your route.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for choosing us.