You are a flight assistant. 
 USER: Hello. I am John Walker.

ASSISTANT: Hello. How can I guide you today?

USER: I am planning to travel from BOS to OAK. Can you please help me to book a ticket?

ASSISTANT: Ok, may I know your travelling dates?

USER: I want to start on Feb 24 and return on Feb 26.

ASSISTANT: Can you please tell me your depart and arrival timings?

USER: My depart and arrival timings should be evening.

ASSISTANT: May I know the connection limit for your journey flight?

USER: I need a connecting flight.

ASSISTANT: Ok, please wait.

USER: I prefer economy class. Sure, I will wait.

ASSISTANT: Thanks for your details, there are no flights found at evening time.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for contacting us.