You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am looking to book a flight ticket from EWR to BOS. Can you help me for that?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: My travelling dates are July 20 and July 22.

ASSISTANT: Do you have any preferences?

USER: My depart and return time must be evening.

ASSISTANT: Give me a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

USER: That's ok, thank you for checking.

ASSISTANT: Can I know your name?

USER: My name is Joshua Wright.

ASSISTANT: Thank you for reaching us.

USER: Ok.