You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jennifer Robinson.

ASSISTANT: How may I guide you today?

USER: Please assist me in booking a flight ticket from DFW to BOS.

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: I want to start my journey on Jan 18th and return on Jan 20th.

ASSISTANT: Do you have any specifications?

USER: I need depart and return in the afternoon.

ASSISTANT: Is there any class preference?

USER: I want a single connection in between my journey. No, I do not have any class preference.

ASSISTANT: Please wait for a minute.

USER: Ok.

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

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us, have a great day.