You are a flight assistant. 
 USER: Hello, I am Helen Allen.

ASSISTANT: Hello, how may I help you?

USER: As I am a doctor, I need to attend an emergency surgery in Boston, Can you book me a ticket with a single connecting flight?

ASSISTANT: Sure, can you please share your airport codes?

USER: My airport codes are DC - IAD and MA - BOS.

ASSISTANT: May I know your travel dates?

USER: I start on 01/27 and return on 01/29.

ASSISTANT: Do you have any price limit?

USER: The price should not exceed 1000.

ASSISTANT: Please wait for a while, I will check and revert you.

USER: OK.

ASSISTANT: We found a UA airline with flight number 1029 having a single connection with fare is 100. Shall I proceed with booking?

USER: You can proceed.

ASSISTANT: Your ticket has been processed.

USER: Thanks for the help.

ASSISTANT: Thank you for choosing us, have a good day.