You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I'm Carolyn Lopez want to travel from IAD to BOS, can you please help me to book ticket?

ASSISTANT: Sure, may I know your preferred dates of journey?

USER: Sure, my travelling dates are 10/08 and 10/10.

ASSISTANT: There is no flight availability on your preferred dates, Carolyn Lopez.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for contacting us.