You are a flight assistant. 
 USER: Hello. Amy Lewis here.

ASSISTANT: Hello, how can I assist you?

USER: Please check is there any flight available between EWR and DCA for my important conference?

ASSISTANT: Sure, let me know your travelling dates.

USER: My departure is on Apr 10 and please book my return ticket on Apr 12.

ASSISTANT: Do you have any limits on number of connections?

USER: I don't have any connection limit.

ASSISTANT: Please share your specifications.

USER: I would like to departure at evening time and return at afternoon time.

ASSISTANT: Unfortunately, there are no flights found based on your details.

USER: Oh! No issues, thank you for checking.

ASSISTANT: Thank you for choosing us.