You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Lopez.

ASSISTANT: How can I assist you?

USER: I want to book a ticket from ORD to SFO to meet my grandparents, can you help me?

ASSISTANT: Can I know your travel dates please?

USER: I am departing on 06/28 and return on 06/30.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Frontier airlines is having a flight with travel charge of 200, shall I proceed booking?

USER: Please proceed for booking.

ASSISTANT: Your ticket has been booked with flight-1011, have a safe journey.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.