You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Sandra Thomas here.

ASSISTANT: How can I assist you today?

USER: My airport codes for boarding the flight are DCA to SFO. Can you reserve a flight ticket?

ASSISTANT: Sure, I can help you with that. May I know your preferable travel dates please?

USER: My preferable dates for travel are 06/24 to 06/26.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Spirit airlines is having a flight on that route with travel charge of 100, shall I proceed for booking?

USER: I am ok with the fare. You can book it.

ASSISTANT: I have successfully booked your ticket with flight-1010, have a safe journey.

USER: Thank you.

ASSISTANT: Thank you so much for choosing us.