You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Sarah Jones.

ASSISTANT: How may I guide you today?

USER: I want to book a ticket from EWR to IAD, can you help me?

ASSISTANT: Can you please share your journey dates?

USER: My travel dates are 10/12 and 10/14.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is no flight found.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for contacting us.