You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Charles Miller here.

ASSISTANT: How can I help you Miller?

USER: As there is a medical issue to my grand mother in DCA, can you please book me a ticket from BOS?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from 11/25 to 11/27.

ASSISTANT: May I know your price limit?

USER: Price limit is 200.

ASSISTANT: There is a Frontier 1015 airline which matches your requirements. Shall I proceed?

USER: Yes, please proceed.

ASSISTANT: Your booking has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you for approaching us.

USER: Welcome.