You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah Scott.

ASSISTANT: How may I help you today?

USER: I want to travel from ORD to BOS. Can you book a flight ticket for me?

ASSISTANT: Sure, can you please share your travelling dates?

USER: I want to travel in the flight on 05/19 and 05/21.

ASSISTANT: Please wait a moment.

USER: Ok, take your own time.

ASSISTANT: Sorry Scott, there are no flights available on your  journey dates.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for reaching our service.